#
# peerscape.daemon.version
#
# Copyright 2009 Helsinki Institute for Information Technology
# and the authors.
#
# Authors: Ken Rimey <rimey@hiit.fi>
#

# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import logging

from peerscape.version import VERSION, Version

IID = '8ec9f9cbd6734e49d48fcc42a63fd779f3887dd6'

class VersionDBMixin(object):
    def is_upgrade_recommended(self):
        try:
            recommended = self.get_recommended_version()
        except LookupError:
            return False

        return Version(VERSION) < Version(recommended)

    def get_recommended_version(self):
        version = self.get(IID, '/version/recommended.txt')
        if not version:
            self.subscribe(IID)
            raise LookupError('Version recommendation not found.')

        return version

    def set_recommended_version(self, version):
        self.put(IID, '/version/recommended.txt', version)

    def log_version(self):
        msg = 'Peerscape version: %s' % VERSION
        if self.is_upgrade_recommended():
            msg += ' (%s recommended)' % self.get_recommended_version()

        logging.info(msg)
